JP6367889B2 - Skiving cutter - Google Patents

Description

  The present invention relates to a skiving cutter for manufacturing an internal gear by skiving an internal gear material.

  For example, a skiving cutter described in Patent Document 1 below includes a barrel-shaped or truncated cone-shaped base and a plurality of blade portions protruding from the outer peripheral surface of the base. The frustoconical shape is a shape of a portion obtained by cutting a cone with a plane parallel to the bottom surface and excluding the side including the apex of the cone. The plurality of blade portions are separated from each other in the circumferential direction with respect to the central axis of the base body. The blade streak of each blade portion extends in a direction inclined with respect to the central axis. Further, the blade portion is divided into a plurality of divided blades by a cutting edge groove extending in a direction intersecting with the blade stripe.

Japanese Patent No. 5864035

  The manufacturer of the internal gear precisely processes the internal gear into a desired shape and desires to extend the life of the cutter used when manufacturing the internal gear.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a skiving cutter capable of precisely forming an internal gear into a desired shape and prolonging the service life.

The skiving cutter as one aspect according to the invention for achieving the above-described object,
A base having a circular cross section perpendicular to the axis, and a plurality of blades protruding from the outer peripheral surface of the base and spaced apart from each other in the circumferential direction with respect to the axis, and in a direction inclined with respect to the axis A blade portion extending from a streak, and the blade portion is divided into a plurality of cutting blades by a cutting blade groove extending in a direction intersecting the blade streaks, The cutting blade has an outer peripheral cutting edge that is the edge farthest from the base, and any one of the plurality of cutting blades constituting the blade portion forms a reference blade. With respect to the axis-cutting edge distance, which is the distance from the axis to the outer peripheral cutting edge, the reference blade is the largest, and the remaining one or more cutting blades can increase the distance from the reference blade to the corresponding cutting blade. As it gets smaller, That twist angle is an angle of the cutting stripes varies depending on the position in the axial direction in the plurality of the cutting blade forming the blade portion.

  Here, it is assumed that the tooth trace is inclined with respect to the workpiece axis, and a constant internal gear is machined by the skiving method at any position in the direction in which the torsion angle of the tooth stripe extends. In the skiving cutter, the reference blade is the largest with respect to the axis-cutting blade distance, and one or more remaining cutting blades of the plurality of cutting blades constituting the blade portion are from the reference blade to the corresponding cutting blade. As the distance increases, it gradually decreases. For this reason, in the skiving cutter, when cutting the blade groove of the workpiece with one blade portion among the plurality of blade portions, the other blade portion should not be originally cut in the workpiece. Can be avoided.

  In the skiving cutter, the twist angle, which is the angle of the blade streak with respect to the axis, differs depending on the position in the axial direction of the plurality of cutting blades constituting the blade portion. For this reason, in the said cutter for skiving processing, all the cutting blades which comprise a blade part can be located in the exact location with respect to the tooth gap of a workpiece | work. Therefore, in the skiving cutter, workpiece machining accuracy can be increased. Further, in the skiving cutter, since all the cutting blades constituting the blade portion can be positioned at an accurate location with respect to the tooth gap of the workpiece, the load applied to each cutting blade constituting the blade portion is reduced. The lifetime of this skiving cutter can be extended.

  Here, in the skiving cutter, the twist angle of one or more cutting blades excluding the reference blade among the plurality of cutting blades constituting the blade portion is a distance from the reference blade to the corresponding cutting blade. As the value increases, the amount of change with respect to the twist angle of the reference blade may increase.

  In the skiving cutter, all the cutting blades constituting the blade portion can be positioned at a more accurate location with respect to the tooth groove of the workpiece.

  Further, in any one of the above cutters for skiving, the twist angle of one or more of the cutting blades excluding the reference blade among the plurality of cutting blades constituting the blade portion corresponds to the reference blade. The distance to the cutting blade may increase as the distance increases.

  In the skiving cutter, all the cutting blades constituting the blade portion can be positioned at a more accurate location with respect to the tooth groove of the workpiece.

  In any one of the above cutters for skiving, the cutting edge of the plurality of cutting blades constituting the blade portion has the highest reference blade, and the two adjacent blade cutting directions in which the blade stripe extends. Of the cutting blades, the cutting edge of one cutting blade far from the reference blade may be less than the cutting edge of the other cutting blade.

  In the skiving cutter, the wear amount of the plurality of cutting blades constituting the blade portion can be made uniform, and the lifetime of the skiving cutter can be extended.

  In any of the above skiving cutters, the cutting width of the plurality of cutting blades constituting the blade portion is the largest of the reference blades, and the two cutting blades adjacent in the blade stripe direction in which the blade stripes extend. Of the blades, the blade width of one cutting blade far from the reference blade may be equal to or smaller than the blade width of the other cutting blade.

  In the skiving cutter, the wear amount of the plurality of cutting blades constituting the blade portion can be made uniform, and the lifetime of the skiving cutter can be extended.

  In any one of the above cutters for skiving processing, the cutting blade includes a rake face that extends from the outer peripheral cutting edge toward the base, and an outer peripheral clearance extending from the outer peripheral cutting edge in a direction along the blade streak. An angle of the rake face with respect to an imaginary plane perpendicular to the blade streak, and a back surface extending from the end opposite to the outer peripheral cutting edge at the outer peripheral flank to the side approaching the base The rake angle may be 0 ° or more and 20 ° or less.

  In the skiving cutter, the cutting load is reduced and the amount of wear of the blade can be reduced as compared with the case where the rake angle is less than 0 °. In addition, in the skiving cutter, the edge strength is higher than when the rake angle exceeds 20 °, and the possibility of causing chipping or the like can be suppressed.

  In the skiving cutter having the back surface, a back surface angle that is an angle of the back surface with respect to a virtual plane perpendicular to the blade stripe may be 10 ° or more and 50 ° or less.

  In the skiving cutter, chips can be discharged smoothly when the back angle is less than 10 °. Further, in the skiving cutter, when the back angle is larger than 50 °, if the length of the outer peripheral flank in the direction in which the blade stripe extends is constant, the cutting blade in the direction in which the blade stripe extends. Can be shortened. Further, if the length of the cutting blade in the direction in which the blade stripe extends is made constant, it is possible to avoid that the length of the outer peripheral flank in the direction in which the blade stripe extends becomes shorter than necessary.

  In any of the above skiving cutters having the outer peripheral flank, the outer peripheral flank angle, which is the angle of the outer peripheral flank with respect to the blade stripe, may be greater than 0 ° and not greater than 12 °.

  In the skiving cutter, when the outer clearance angle is 0 ° or less, it is possible to avoid rubbing the bottom portion of the internal gear with the outer peripheral clearance surface, and the surface property at the bottom portion of the internal gear is deteriorated. And the wear of the outer peripheral flank can be suppressed. In addition, the skiving cutter can be easily manufactured by increasing the effective tooth width of the cutter with respect to the case where the outer clearance angle exceeds 12 °, and the cutter life can be extended. .

  In any of the above skiving cutters, the outer peripheral cutting edge of the cutting blade having a twist angle of 10 ° or less may be in a virtual plane perpendicular to the axis.

  In the skiving cutter, each outer peripheral cutting edge of a plurality of cutting blades having the same position in the axial direction extends in one virtual plane perpendicular to the axial line. For this reason, in the cutter for skiving, the outer peripheral cutting edges of a plurality of cutting blades whose axial positions are the same as each other, and the rake face connected to the outer peripheral cutting blade are joined together by the adjacent cutting blades in the circumferential direction. Can be processed.

  In any of the above skiving cutters, the outer peripheral cutting edge of the cutting blade having a twist angle α larger than 10 ° may be in a virtual plane perpendicular to the blade stripe.

  In the skiving cutter, the direction in which the blade stripe extends is the cutting direction. For this reason, if the outer peripheral cutting edge extends in a virtual plane perpendicular to the blade streak, the cutting load on both sides of the outer peripheral cutting edge becomes equal, and the amount of wear at each position of the outer peripheral cutting edge is uniform. Can be

  In any one of the above cutters for skiving processing, the cutter includes a plurality of cutter pieces arranged in the axial direction, and the cutter pieces are arranged in the axial direction among the cutting blades constituting each of the plurality of blade portions. A cutting blade row that is a group of a plurality of cutting blades whose positions coincide with each other and are arranged in the circumferential direction, and a cutting base in which the cutting blade row is formed on the outer periphery in a part of the base body, The divided base is separable from each other, and may further include a positioning member that determines a relative position in the circumferential direction of the cutting blade between the plurality of cutter pieces.

  The skiving cutter includes a plurality of divided bases that can be separated from each other, and only one of the plurality of divided blades constituting one blade portion is formed on one divided base. ing. For this reason, one parting blade can be processed without interfering with the other parting blade which comprises this blade part among several parting blades which comprise one blade part.

  According to the skiving cutter of one embodiment of the present invention, the internal gear can be precisely formed in a desired shape, and its life can be extended.

It is a perspective view of the skiving machine in a first embodiment. It is a perspective view of the cutter for skiving processing in a first embodiment. It is the III-III sectional view taken on the line in FIG. It is a perspective view of the division blade in a first embodiment. It is the VV sectional view taken on the line in FIG. FIG. 5 is a sectional view taken along line VI-VI in FIG. 4. It is explanatory drawing for demonstrating the size of the some cutting blade which comprises the blade part in 1st embodiment. It is explanatory drawing which shows the twist angle of the some cutting blade which comprises the blade part in 1st embodiment, and the position of the circumferential direction. It is a graph which shows the variation | change_quantity of the twist angle of the some cutting blade which comprises the blade part in 1st embodiment. It is a perspective view of the cutter for skiving processing and a work in process in a first embodiment. It is a side view of the cutter for skiving processing in processing in a first embodiment. It is a side view of the cutter for skiving processing in a second embodiment. It is a side view of the cutter for skiving processing in a third embodiment. It is a perspective view of the cutter for skiving processing in a third embodiment. It is the XV-XV sectional view taken on the line in FIG. It is a side view of the cutter for skiving processing in a fourth embodiment.

  Hereinafter, various embodiments of a skiving cutter according to the present invention will be described with reference to the drawings.

"First embodiment"
A first embodiment of a skiving cutter will be described with reference to FIGS.

  First, a skiving machine equipped with a skiving cutter will be described.

  As shown in FIG. 1, the skiving machine includes a bed 1, a column 2, a saddle 3, a head 4, a slider 5, a spindle unit 6, and a rotary table 7.

  The column 2 extends in the vertical direction. Here, the vertical direction is the Z direction, the direction perpendicular to the Z direction is the Y direction, and the direction perpendicular to the Z direction and the Y direction is the X direction. The column 2 is attached to the bed 1 so as to be movable in the X direction. The saddle 3 is attached to the column 2 so as to be movable in the Z direction. The head 4 is attached to the saddle 3 so as to be rotatable around a head axis Ah extending in the X direction. The slider 5 is attached to the head 4 so as to be movable in a direction perpendicular to the head axis Ah. The spindle unit 6 is fixed to the slider 5. The main spindle unit 6 holds the skiving cutter 100 via the cutter arbor 10 and rotates the skiving cutter 100 about the main axis Am. The cutter axis Ac that is the rotation center axis of the skiving cutter 100 is positioned on the extension of the main axis Am of the main shaft unit 6 while being held by the main shaft unit 6.

  The turntable 7 is disposed on the bed 1 at a position away from the column 2 in the X direction. The turntable 7 is provided on the bed 1 so as to be rotatable about a table axis At extending in the Z direction. On the turntable 7, a work holder 19 for holding a cylindrical work W, which is an internal gear material, is attached.

  As shown in FIGS. 2 and 3, the skiving cutter 100 includes a barrel-shaped base 110 centered on the cutter axis Ac, and a plurality of blade portions 120 protruding from the outer peripheral surface of the base 110. In the following, the direction in which the cutter axis Ac extends is referred to as an axial direction Da, and the circumferential direction with respect to the cutter axis Ac is simply referred to as a circumferential direction Dc. In addition, one side in the axial direction Da is defined as a tip side Daa, and the other side is defined as a mounting side Dab.

  As described above, the base body 110 has a barrel shape with the cutter axis Ac as the center. For this reason, the base 110 has a circular cross-sectional shape perpendicular to the cutter axis Ac at any position in the axial direction Da. The base body 110 has a maximum outer diameter at the center position in the axial direction Da, and gradually decreases in outer diameter from the center position toward the distal end side Daa and the attachment side Dab. The base 110 is formed with a mounting hole 112 penetrating in the axial direction Da. The mounting hole 112 is cylindrical with the cutter axis Ac as the center. The base 110 is further formed with a key groove 113 that is recessed from the inner peripheral surface of the mounting hole 112 to the radially outer side with respect to the cutter axis line Ac. The key groove 113 extends in the axial direction Da from the end surface of the attachment side Dab of the base 110 to the end surface of the front end side Daa.

  The cutter arbor 10 includes a cutter attachment portion 12 that can be inserted into the attachment hole 112 of the skiving cutter 100 and a held portion 15 that is held by the spindle unit 6. The cutter mounting portion 12 and the held portion 15 are both cylindrical with the arbor axis Aa as the center. The arbor axis Aa coincides with the cutter axis Ac in a state where the cutter mounting portion 12 is inserted into the mounting hole 112 of the skiving cutter 100. Therefore, hereinafter, for convenience, the direction in which the arbor axis Aa extends is also the axis direction Da in which the cutter axis Ac extends, and one side of the direction in which the arbor axis Aa extends is referred to as the tip side Daa and the other side as the attachment side Dab. To do.

  The outer diameter of the held portion 15 is larger than the outer diameter of the cutter mounting portion 12. The cutter mounting portion 12 is provided on the distal end side Daa of the held portion 15. The cutter mounting portion 12 is formed with a key groove 13 that is recessed from the outer peripheral surface of the cutter mounting portion 12 inward in the radial direction with respect to the arbor axis Aa. The key groove 13 extends in the axial direction Da. A male screw 14 is formed on the tip side Daa of the cutter mounting portion 12.

  When attaching the skiving cutter 100 to the cutter arbor 10, first, the cutter attachment portion 12 of the cutter arbor 10 is inserted into the attachment hole 112 of the skiving cutter 100. Next, the key 17 is inserted into the key space formed by the keyway 113 of the skiving cutter 100 and the keyway 13 of the cutter arbor 10. Then, the fixing nut 18 is screwed into the male screw 14 of the cutter arbor 10. Thus, the attachment of the skiving cutter 100 to the cutter arbor 10 is completed.

  The plurality of blade portions 120 are separated from each other in the circumferential direction Dc. The blade stripe L of each blade portion 120 extends in a direction inclined with respect to the cutter axis Ac. Further, the blade part 120 is divided into a plurality of cutting blades 122 by cutting edge grooves 121 extending in a direction intersecting with the blade stripe L. In the present embodiment, one blade part 120 has four or five parting blades 122. In FIG. 3, for the sake of convenience, a plurality of cutting blades 122 constituting one blade portion 120 are drawn side by side in the axial direction Da in a virtual plane including the cutter axis Ac.

  As shown in FIGS. 4 to 6, the dividing blade 122 has an outer peripheral cutting edge 123, a pair of side cutting edges 124, a rake face 125, an outer peripheral flank 126, a back surface 127, and a pair of side flank 128. The rake face 125, the pair of side clearance faces 128, and the back face 127 all extend from the outer peripheral face of the base 110 toward the radially outer side with respect to the cutter axis line Ac. The rake face 125 faces the front end side Daa in the direction in which the blade stripe L extends. The pair of side clearance surfaces 128 face a direction having a direction component perpendicular to the blade stripe L. The pair of side clearance surfaces 128 are in a back-to-back relationship. The back surface 127 is located on the attachment side Dab in the direction in which the blade streaks L extend from the rake face 125 and faces the attachment side Dab in the direction in which the blade streaks L extend. The back surface 127 is in a back-to-back relationship with the rake surface 125. The outer peripheral flank 126 extends in the direction along the blade streak L from the radially outer edge of the rake face 125 to the radially outer edge of the back face 127. The outer peripheral cutting edge 123 is formed by an edge that is an angle between the rake face 125 and the outer peripheral flank 126. Therefore, the rake face 125 extends from the outer peripheral cutting edge 123 toward the side closer to the base 110. Further, the back surface 127 spreads from the end opposite to the outer peripheral cutting edge 123 on the outer peripheral flank 126 to the base 110 side. The outer peripheral cutting edge 123 is farthest from the base 110 among the portions where the cutting blade 122 is formed. The side cutting edge 124 is formed by an edge that is an angle between the rake face 125 and the side flank 128.

  As shown in FIG. 5, the rake angle θ1, which is the angle of the rake face 125 with respect to the virtual plane Pa perpendicular to the blade stripe L, is 0 ° or more and 20 ° or less. If the rake angle θ1 is less than 0 °, the cutting load increases, the surface properties of the machined surface deteriorate, and the amount of wear may increase. On the other hand, when the rake angle θ1 exceeds 20 °, the strength of the blade edge is lowered, and chipping or the like may be caused. For this reason, it is preferable that rake angle (theta) 1 is the above angle range.

  The outer peripheral clearance angle θ2, which is the angle of the outer peripheral clearance surface 126 with respect to the blade streak L, is greater than 0 ° and equal to or less than 12 °. If the outer clearance angle θ2 is 0 ° or less, the outer clearance surface 126 rubs the tooth bottom of the internal gear, the surface property of the inner gear teeth bottom deteriorates, and the amount of wear on the outer clearance surface 126 increases. Become. In addition, when the outer clearance angle θ2 exceeds 12 °, it is difficult to manufacture by increasing the effective tooth width of the cutter, and it becomes difficult to extend the life of the cutter. For this reason, it is preferable that outer periphery relief angle (theta) 2 is the above angle range. The outer peripheral clearance angle θ2 is particularly preferably 5 ° or more. This is because, when the outer peripheral clearance angle θ2 is 5 ° or more, rubbing of the outer peripheral clearance surface 126 due to the spring back accompanying the elastic deformation of the cutting blade 122 during cutting can be surely avoided.

  The back surface angle θ3, which is the angle of the back surface 127 with respect to the virtual plane Pa perpendicular to the blade stripe L, is 10 ° or more and 50 ° or less. When the back surface angle θ3 is less than 10 °, there is a possibility that the chips are not smoothly discharged from the outer peripheral cutting edge 123 of the cutting blade 122 positioned on the attachment side Dab with respect to the cutting blade 122. When the back surface angle θ3 is larger than 50 °, if the length of the outer peripheral flank 126 in the direction in which the blade stripe L extends is constant, the length of the dividing blade 122 in the direction in which the blade stripe L extends is unnecessarily long. Become. When the back surface angle θ3 is greater than 50 °, if the length of the cutting blade 122 in the direction in which the blade stripe L extends is constant, the length of the outer peripheral flank 126 in the direction in which the blade stripe L extends is longer than necessary. Shorter. For this reason, it is preferable that the back surface angle θ3 is in the above angle range.

  As shown in FIG. 6, the side clearance angle θ4, which is the angle of the side clearance surface 128 with respect to the blade stripe L, is greater than 0 ° and not more than 5 °. If the side clearance angle θ3 is 0 ° or less, the cutting load increases, the surface properties of the machined surface deteriorate, and the amount of wear may increase. On the other hand, when the side clearance angle θ4 exceeds 20 °, the strength of the blade edge is lowered, which may cause chipping or the like. For this reason, it is preferable that the side clearance angle θ4 is in the above angle range. The side clearance angle θ4 is particularly preferably 2 ° or more.

  As shown in FIG. 4, of the pair of groove side surfaces forming the cutting edge groove 121, one side surface forms the back surface 127 of the cutting blade 122, and the other side surface forms the rake face 125 of the cutting blade 122.

  Here, as shown in FIG. 3, among the plurality of parting blades 122 constituting the blade part 120, the parting blade 122 formed in the central part of the base 110 in the axial direction Da is defined as a finishing edge (reference edge) 122a. The remaining parting blades 122 are rough blades 122b and 122c. Further, the distance from the cutter axis Ac to the outer peripheral cutting edge 123 is defined as an axis line-cutting edge distance D. Of each axis line-cutting edge distance D of the plurality of parting blades 122 constituting the blade part 120, the axis line-cutting edge distance D0 of the finishing blade 122a is the largest. As the distance from the finishing blade 122a increases, the plurality of rough blades 122b and 122c gradually decrease in the axis-cutting edge distance D. In other words, the axial line-cutting edge distance D1 of the first rough blade 122b adjacent to the finishing blade 122a in the direction in which the blade streak L extends is next to the axial line-cutting blade distance D0 of the finishing blade 122a. The axial line-cutting edge distance D2 of the second rough blade 122c is adjacent to the first rough blade 122b on the side opposite to the finishing blade 122a in the direction in which the blade stripe L extends. Next to distance D1. That is, the axis line-cutting edge distance D decreases in the order of the finishing blade 122a, the first rough blade 122b, and the second rough blade 122c.

  As shown in FIG. 7, the blade edge h0 of the finishing blade 122a is the largest among the blade edge h of the plurality of parting blades 122 constituting the blade part 120. Of the plurality of parting blades 122 constituting the blade part 120, of the two parting blades 122 adjacent to each other in the blade line direction in which the blade line L extends, the blade edge h of one parting blade 122 far from the finishing blade 122a is the other. The cutting edge 122 of the cutting blade 122 is not more than h. That is, the blade h1 of the first rough blade 122b is less than or equal to the blade h0 of the finishing blade 122a, and the blade h2 of the second rough blade 122c is less than or equal to the blade h1 of the first rough blade 122b. Therefore, in this embodiment, the cutting edge 122 of the cutting blade 122 has the smallest cutting blade 122 on the distal end side Daa, and the cutting blade 122 has an indentation so that it is positioned on the attachment side Dab until reaching the finishing blade 122a. growing.

  Moreover, the blade width w0 of the finishing blade 122a is the widest among the blade widths w of the plurality of cutting blades 122 constituting the blade portion 120. Of the plurality of parting blades 122 constituting the blade part 120, of the two parting blades 122 adjacent in the blade streak direction, the blade width w of one parting blade 122 far from the finishing blade 122 a is the same as that of the other parting blade 122. The blade width is less than or equal to w. That is, the blade width w1 of the first rough blade 122b is equal to or smaller than the blade width w0 of the finishing blade 122a, and the blade width w2 of the second rough blade 122c is equal to or smaller than the blade width w2 of the first rough blade 122b. Therefore, in this embodiment, the cutting blade 122 has a narrower blade width as the cutting blade 122 on the tip side Daa is the narrowest and reaches the finishing blade 122a so as to be positioned on the attachment side Dab. Become.

  As shown in FIG. 8, the twist angle α, which is the angle of the blade streak L with respect to the cutter axis Ac, varies depending on the position of the blade streak L in the axial direction Da. Therefore, the twist angle α for each of the plurality of cutting blades 122 constituting the blade portion 120 varies depending on the position of each cutting blade 122 in the axial direction Da. In other words, the twist angle α for each of the plurality of rough blades 122b and 122c varies depending on the distance from the finishing blade 122a to each of the rough blades 122b and 122c. Further, the twist angle α of the blade streak L is different depending on the position of the blade streak L in the axial direction Da, and the circumferential direction Dc is different from the case where the twist angle α is constant at each position in the axial direction Da. The positions of the plurality of parting blades 122 are different. FIG. 8 shows a state in which the outer peripheral surface of the base 110 is developed on a plane.

  As shown in FIG. 9, the change amounts Δ1, Δ2 of the twist angle α of the rough blades 122b, 122c with respect to the twist angle α0 of the finishing blade 122a increase as the distance from the finishing blade 122a increases. That is, the change amount Δ2 of the twist angle α of the second rough blade 122c is larger than the change amount Δ1 of the twist angle α of the first rough blade 122b.

  In addition, as shown in FIG. 8, the twist angles α1 and α2 of the plurality of cutting blades 122b and 122c excluding the finishing blade 122a among the plurality of cutting blades 122 constituting the blade portion 120 are determined from the finishing blade 122a. The distance to 122b and 122c increases as the distance increases. In FIG. 8, α0 is the twist angle of the finishing blade 122a, α1 is the twist angle of the first rough blade 122b, and α2 is the twist angle of the second rough blade 122c.

  When manufacturing the internal gear, as shown in FIG. 1, a cylindrical workpiece W, which is an internal gear material, is held by a workpiece holder 19 on the rotary table 7. At this time, the table axis At of the rotary table 7 coincides with the workpiece axis Aw that is the central axis of the cylindrical workpiece W. Further, the skiving cutter 100 described above is mounted on the spindle unit 6 of the skiving machine. Next, the head 4 is rotated around the head axis Ah with respect to the saddle 3, and the main axis Am of the main shaft unit 6 is tilted with respect to the work axis Aw. In addition, the order which performs the above process is not limited to the order demonstrated above. As a result, as shown in FIGS. 10 and 11, the cutter axis Ac is inclined with respect to the workpiece axis Aw. In this state, the workpiece W is rotated about the workpiece axis Aw, and the skiving cutter 100 is reciprocated in the Z direction while rotating about the cutter axis Ac. The skiving method is a method of machining the workpiece W in such a state that the cutter axis Ac is inclined with respect to the workpiece axis Aw.

  In this skiving method, as shown in FIGS. 10 and 11, among the plurality of cutting blades 122 constituting the blade portion 120, the cutting blade 122 on the attachment side Dab rather than the finishing blade 122 a does not contact the workpiece W. . That is, among the plurality of parting blades 122 constituting the blade part 120, the parting blade 122 on the attachment side Dab rather than the finishing blade 122a does not contribute to skiving.

  Of the plurality of cutting blades 122 constituting the blade portion 120, the cutting blade 122c on the most distal end side Daa first contacts the workpiece W, and then only one cutting blade 122b on the attachment side Dab is connected to the cutting blade 122c. Next, the cutting blade 122a on the attachment side Dab contacts the workpiece W. That is, in the present embodiment, the second rough blade 122c first contacts the workpiece W, then the first rough blade 122b contacts the workpiece W, and finally the finishing blade 122a contacts the workpiece W.

  If each blade edge of the plurality of cutting blades 122 constituting the blade portion 120 is the same and each blade width is the same, the cutting load applied to the cutting blade 122c on the most distal side Daa is the remaining cutting. Compared with the cutting load applied to the blade 122, the amount of wear of the cutting blade 122c at the most distal end Daa is significantly larger than the amount of wear of the remaining cutting blades 122. On the other hand, in the present embodiment, the blade edge of the cutting blade 122 increases as it is positioned from the most distal end Daa to the mounting side Dab, and the cutting blade 122 increases from the most distal end Daa to the mounting side Dab. Since the blade width is wide, the wear amount of the plurality of cutting blades 122 can be made uniform, and the life of the skiving cutter 100 can be extended.

  Here, as shown in FIG. 10, the tooth line Lw is inclined with respect to the workpiece axis Aw, and the twisted angle of the tooth line Lw is set to a certain internal gear at any position in the extending direction of the workpiece axis Aw. Suppose that it is processed by the bing method. Further, the axial line-cutting edge distance D of each of the plurality of cutting blades 122 constituting the blade portion 120 of the skiving cutter 100 is constant, in other words, the outer shape of the skiving cutter 100 is cylindrical. And In this case, depending on the inclination angle of the cutter axis Ac with respect to the workpiece axis Aw, when the blade groove of the workpiece W is being cut by one blade portion 120 among the plurality of blade portions 120, the other blade portions 120 may be An area that should not be cut in W may be cut. In the present embodiment, the finishing blade 122a is the largest with respect to each axis-cutting blade distance D of the plurality of cutting blades 122 constituting the blade portion 120, and the distance from the finishing blade 122a to the rough blades 122b and 122c can be increased. It gradually gets smaller. For this reason, in the cutter 100 for skiving processing of this embodiment, when cutting the tooth gap of the workpiece W by one blade portion 120 among the plurality of blade portions 120, the other blade portion 120 is moved to the workpiece W. It is possible to avoid cutting an area that should not be cut.

  The inventor has the largest finishing blade 122a with respect to each axis-cutting blade distance D of the plurality of cutting blades 122, and gradually decreases as the distance from the finishing blade 122a to the corresponding rough blades 122b, 122c increases. When the workpiece W was machined by the skiving machining method with the skiving machining cutter 100, it was found that the machining accuracy of each tooth of the internal gear formed by this machining was lower than the originally planned machining accuracy. Therefore, the inventor tried to simulate on the computer the processing of the workpiece W by the skiving cutter 100 in which the twist angles α of the plurality of cutting blades 122 constituting the blade portion 120 are constant. As a result, when one blade portion 120 is machining one tooth groove in the workpiece W, as shown in FIG. 11, one cutting blade 122 that constitutes the blade portion 120, for example, a finishing blade 122a, Even if it is located at an accurate location with respect to the tooth groove, another cutting blade 122 that constitutes the blade portion 120, for example, the second rough blade 122cc (shown by a two-dot broken line in FIG. 11) becomes the tooth groove. On the other hand, it was found that it was not located at the correct location. When this phenomenon is examined in detail, each rough blade 122b, 122c with respect to the tooth groove of the workpiece W is determined according to the distance d from the virtual plane Pw including the workpiece axis Aw and the position where the finishing blade 122a is in contact with the workpiece W. It was found that there was a change in the amount of deviation. Therefore, by changing the torsion angles α1 and α2 of the rough blades 122b and 122c as described above with respect to the torsion angle α0 of the finishing blade 122a, all the cutting blades 122 constituting the blade portion 120 are changed to the tooth groove of the workpiece W. It is now possible to position it at an exact location. As described above, when the twist angle α of the blade streak L is changed in accordance with the position of the blade streak L in the axial direction Da, the twist direction α is constant in each position in the axial direction Da in the circumferential direction. The positions of the plurality of cutting blades 122 in Dc are different.

  Since the skiving cutter 100 of the present embodiment changes the twist angles α1, α2 of the rough blades 122b, 122c as described above with respect to the twist angle α0 of the finishing blade 122a, as described above. In addition, all the cutting blades 122 constituting the blade portion 120 can be positioned at an accurate location with respect to the tooth gap of the workpiece W. Therefore, in the skiving machining cutter 100 of this embodiment, the machining accuracy of the workpiece W can be increased. Further, in the skiving cutter 100 of the present embodiment, since all the cutting blades 122 constituting the blade portion 120 can be positioned at an accurate location with respect to the tooth groove of the workpiece W, the blade portion 120 is configured. Thus, the load applied to each cutting blade 122 can be suppressed, and the lifetime of the skiving cutter 100 can be extended.

  In the present embodiment, one blade portion 120 has four or five dividing blades 122, and three of the cutting blades 122 contribute to skiving processing. However, one blade part 120 may have three parting blades 122, and two parting blades 122 may contribute to skiving, and one blade part 120 may have more than five parting blades 122. And four or more of the cutting blades 122 may contribute to skiving.

"Second embodiment"
A second embodiment of the skiving cutter will be described with reference to FIG.

  Similar to the skiving cutter 100 of the first embodiment, the skiving cutter 200 of the present embodiment also has a base 210 and a plurality of blade portions 220 protruding from the outer peripheral surface of the base 210. The base body 210 of the present embodiment has a truncated cone shape centering on the shape of the tip side Daa of the barrel-shaped base body 110 in the first embodiment or the cutter axis line Ac. Therefore, the base body 210 has a circular cross-sectional shape perpendicular to the cutter axis Ac at any position in the axial direction Da. The base 210 has the largest outer diameter at the end of the attachment side Dab, and the outer diameter gradually decreases toward the distal end side Daa.

  The plurality of blade portions 220 are separated from each other in the circumferential direction Dc. The blade stripe L of each blade portion 220 extends in a direction inclined with respect to the cutter axis Ac. The blade portion 220 is divided into a plurality of cutting blades 222 by cutting edge grooves 221 extending in a direction intersecting the blade stripe L. In the present embodiment, the axis-cutting edge distance D0 of the cutting blade 222 of the attachment side Dab is the largest among the axis-cutting blade distances D of the plurality of cutting blades 222 constituting the blade part 220, and the tip-side Daa As the cutting edge 222 is reached, the axis-cutting edge distance D gradually decreases. In other words, in the present embodiment, among the plurality of parting blades 222 constituting the blade part 220, the parting blade 222 located closest to the attachment side Dab forms the finishing blade (reference blade) 222a, and the other parting blades 222 forms rough blades 222b to 222e.

  Each cutting blade 222 has an outer peripheral cutting edge, a pair of side cutting edges, a rake face, an outer peripheral flank face, a back surface, and a pair of side flank faces, similar to the cutting blade 122 of the first embodiment. The rake angle of the rake face, the outer peripheral flank angle of the outer flank face, the rear back face angle, and the side flank angle of the side flank face are all within the angle range described in the first embodiment. The dimensional relationship between the blades of the plurality of cutting blades 222 constituting the blade part 220 is the relationship described in the first embodiment. In addition, the dimensional relationship between the blade widths of the plurality of cutting blades 222 constituting the blade portion 220 is the relationship described in the first embodiment. The relationship between the twist angles of the plurality of cutting blades 222 constituting the blade part 220 is the relationship described in the first embodiment.

  Similarly to the skiving cutter 100 of the first embodiment, the skiving cutter 200 of the present embodiment also changes the twist angle α of the rough blades 222b to 222e with respect to the twist angle α of the finishing blade 222a. Therefore, the processing accuracy of the workpiece W can be increased and the life of the skiving cutter 200 can be extended.

  In the skiving cutter 200 of the present embodiment, as described above, the cutting blade 222 located closest to the attachment side Dab forms the finishing blade (reference blade) 222a, and the other cutting blades 222 are rough. Since the blades 222b to 222e are formed, all the cutting blades 222 can contribute to the processing of the workpiece W.

  In the present embodiment, one blade part 220 has four or five parting blades 222. However, the number of the cutting blades 222 included in one blade part 220 may be smaller than this, or conversely, may be larger than this.

"Third embodiment"
A third embodiment of the skiving cutter will be described with reference to FIGS.

  As shown in FIGS. 13 and 14, the skiving cutter 300 according to the present embodiment is similar to the skiving cutter 100 according to the first embodiment, and the base 310 and a plurality of protrusions protruding from the outer peripheral surface of the base 310. And the blade portion 320. The substrate 310 of this embodiment also has a circular cross-sectional shape perpendicular to the cutter axis Ac at any position in the axial direction Da.

  As shown in FIG. 15, the base body 310 of the present embodiment includes a plurality of divided base bodies 311 that are arranged in the axial direction Da and can be separated from each other, and positioning pins 319. The number of the divided substrates 311 in the present embodiment is three. Among the plurality of divided bases 311, the outer diameter of the divided base 311 a on the attachment side Dab is the largest, and the outer diameter decreases as the divided bases 311 b and 311 c on the distal end side Daa are obtained.

  The plurality of blade portions 320 are separated from each other in the circumferential direction on the outer peripheral surface of the base 310. The blade stripe L of each blade portion 320 extends in a direction inclined with respect to the cutter axis Ac. The blade 320 is divided into a plurality of cutting blades 322 by cutting blade grooves 321 extending in a direction intersecting the blade stripe L. In the present embodiment, the number of the cutting blades 322 constituting one blade part 320 is three, which is the same as the number of the cutting bases 311. Each of the cutting blades 322 constituting one blade part 320 is formed on a different cutting base 311. Therefore, among the plurality of cutting blades 322 constituting each of the plurality of blade portions 320, one cutting base 311 includes a plurality of cutting blades 322 whose positions in the axial direction Da coincide with each other and are arranged in the circumferential direction. A parting blade row is formed.

  As shown in FIG. 15, the plurality of divided base bodies 311 are each formed with a mounting hole 312 penetrating in the axial direction Da. The inner diameters of the mounting holes 312 of the plurality of divided base bodies 311 are the same. In the divided base 311, a key groove 313 is further formed that is recessed from the inner peripheral surface of the mounting hole 312 to the radially outer side with respect to the cutter axis Ac. The key groove 313 extends in the axial direction Da from the end surface of the attachment side Dab of the divided base 311 to the end surface of the distal end side Daa. The plurality of divided bases 311 are further formed with pin holes 318 that are parallel to the cutter axis Ac and penetrate in the axial direction Da.

  Of each of the plurality of cutting blades 322 constituting the blade part 320, the axis of the cutting blade 322 formed on the cutting blade 322 on the most mounting side Dab, that is, the cutting base 311 on the most mounting side Dab, among the axis-cutting blade distances D. -As the cutting edge distance D is the largest and becomes the cutting edge 322 on the tip side Daa, the axis-cutting edge distance D gradually decreases. In other words, also in this embodiment, as in the second embodiment, among the plurality of cutting blades 322 constituting the blade portion 320, the cutting blade 322 located closest to the attachment side Dab is the finishing blade (reference blade) 322a. The other cutting blades 322 form rough blades 322b and 322c. Therefore, among the plurality of divided bases 311, only the plurality of finishing blades 322 a are formed on the divided base 311 a on the most mounting side Dab. In this embodiment, the cutting base 311a and the finishing blades 322a constitute a finishing blade cutter piece 301a. Of the plurality of divided substrates 311, only the plurality of first rough blades 322b are formed on the divided substrate 311b adjacent to the divided substrate 311a on which the finishing blade 322a is formed. In this embodiment, the divided base 311b and the plurality of first rough edges 322b constitute a first rough edge cutter piece 301b. Of the plurality of divided substrates 311, only the plurality of second rough blades 322c are formed on the remaining divided substrate 311c. In the present embodiment, the divided base 311c and the plurality of second rough blades 322c constitute a second rough blade cutter piece 301c.

  Each cutting blade 322 has an outer peripheral cutting edge, a pair of side cutting edges, a rake face, an outer peripheral flank face, a back surface, and a pair of side flank faces, similar to the cutting blade 122 of the first embodiment. The rake angle of the rake face, the outer peripheral flank angle of the outer flank face, the rear back face angle, and the side flank angle of the side flank face are all within the angle range described in the first embodiment. The dimensional relationship between the blades of the plurality of cutting blades 322 constituting the blade part 320 is the relationship described in the first embodiment. Moreover, the dimensional relationship of the blade widths of the plurality of cutting blades 322 constituting the blade portion 320 is the relationship described in the first embodiment. The relationship between the twist angles α of the plurality of cutting blades 322 constituting the blade part 320 is the relationship described in the first embodiment.

  As described above, the base body 310 of the present embodiment includes a plurality of divided base bodies 311 that are separable from each other. For this reason, the plurality of divided base bodies 311 can change the mutual positional relationship in the axial direction Da, and can also change the mutual positional relationship in the circumferential direction with respect to the cutter axis Ac. In the present embodiment, it is extremely important to accurately determine the mutual positional relationship in the circumferential direction Dc among the plurality of cutting blades 322 constituting the blade portion 320 of the skiving cutter 300.

  When the skiving cutter 300 is attached to the cutter arbor 10, first, the cutter attachment portion 12 of the cutter arbor 10 is inserted into each attachment hole 312 of the plurality of divided base bodies 311. Next, the mutual positional relationship in the circumferential direction of the plurality of divided substrates 311 is adjusted so that the pin holes 318 of the plurality of divided substrates 311 are linearly connected. Then, a positioning pin 319 as a positioning member is inserted into each pin hole 318 of the plurality of divided base bodies 311. As a result, in this embodiment, the mutual positional relationship of the circumferential direction in the some cutting blade 322 which comprises the blade part 320 can be defined correctly. Thereafter, the keys 17 are inserted into the key spaces formed by the key grooves 313 of the plurality of divided base bodies 311 and the key grooves 13 of the cutter arbor 10. Then, the fixing nut 18 is screwed into the male screw 14 of the cutter arbor 10. As a result, the plurality of divided base bodies 311 are sandwiched between the held portion 15 of the cutter arbor 10 and the fixing nut 18 so that the mutual positional relationship is determined in the axial direction Da, and the plurality of divided base bodies 311 are attached to the cutter arbor 10. Fixed. Thus, the attachment of the skiving cutter 100 of the present embodiment to the cutter arbor 10 is completed.

  Similarly to the skiving cutter 100 of the first embodiment, the skiving cutter 300 of the present embodiment also changes the twist angle α of the rough blades 322b and 322c with respect to the twist angle α of the finishing blade 322a. Therefore, the processing accuracy of the workpiece W can be increased and the life of the skiving cutter 300 can be extended.

  Further, in the skiving cutter 300 according to the present embodiment, the cutting blade 322 located closest to the attachment side Dab forms the finishing blade (reference blade) 322a, like the skiving cutter 100 according to the second embodiment. In addition, since the other cutting blades 322 form the rough blades 322b and 322c, all the cutting blades 322 can contribute to the machining of the workpiece W.

  In addition, the base body 310 of the skiving cutter 100 according to the present embodiment is composed of divided base bodies 311 that are separable from each other, and moreover, one split base body 311 includes a plurality of cutting blades that form one blade portion 320. Of the 322, only one parting blade 322 is formed. For this reason, one parting blade 322 among a plurality of parting blades 322 constituting one blade part 320 can be processed without interfering with another parting blade 322 constituting this blade part 320. Therefore, in this embodiment, the cutting blade 322 can be processed easily.

"Fourth embodiment"
A fourth embodiment of the skiving cutter will be described with reference to FIG.

  The skiving cutter 400 according to this embodiment is basically the same as the skiving cutter 300 according to the third embodiment. That is, the skiving cutter 400 according to the present embodiment includes a finishing cutter piece 401a, a first rough blade cutter piece 401b, a second rough blade cutter piece 401c, and a positioning pin 419. Each cutter piece 401 a, 401 b, 401 c has one divided base 411 and a plurality of dividing blades 422. The base 410 is composed of three divided bases 411. One blade portion 420 includes one cutting blade 422 of the finishing cutter piece 401a, one cutting blade 422 of the first rough blade cutter piece 401b, and one cutting blade 422 of the second rough blade cutter piece 401c. Is done. Various specifications of the plurality of cutting blades 422 constituting the blade portion 420 are basically the same as the various specifications of the cutting blades in the above embodiments. However, the twist angle α of each cutting blade 422 of the present embodiment is 10 ° or less, and the outer peripheral cutting blade 423 of each cutting blade 422 is in a virtual plane Pb perpendicular to the cutter axis Ac.

  In each embodiment described above, the twist angle α of the dividing blade is an example larger than 10 °. In this case, the outer peripheral cutting edge of the dividing blade is in a virtual plane perpendicular to the blade stripe L. In the cutting blade of the skiving cutter, the direction in which the blade stripe L extends is the cutting direction. For this reason, if the outer peripheral cutting edge is in a virtual plane perpendicular to the blade streak L, that is, extends in a direction perpendicular to the blade streak L, the cutting loads on both sides of the outer peripheral cutting edge are equal. Thus, the wear amount at each position of the outer peripheral cutting edge can be made uniform.

  The outer peripheral cutting edge 423 of the present embodiment is not in a virtual plane perpendicular to the blade stripe L. However, when the twist angle α of the dividing blade 422 is 10 ° or less as in the present embodiment, the outer peripheral cutting edge 423 is not included in the virtual plane perpendicular to the cutter axis Ac. , It is in a virtual plane substantially perpendicular to the blade streak L. For this reason, also in the present embodiment, the cutting loads at both sides of the outer peripheral cutting edge 423 are substantially equal, and the wear amount at each position of the outer peripheral cutting edge 423 can be made substantially uniform. In the present embodiment, the plurality of cutting blades 422 formed on one cutter piece 401a, 401b, 401c all have the same position in the axial direction Da, and the outer peripheral cutting edge 423 has the cutter axis Ac. Is in a virtual plane Pb perpendicular to. Therefore, each outer peripheral cutting edge 423 in the plurality of cutting blades 422 formed in one cutter piece 401a, 401b, 401c is in one virtual plane Pb perpendicular to the cutter axis line Ac. For this reason, in this embodiment, the outer peripheral cutting edges 423 of the plurality of cutting blades 422 formed on one cutter piece 401a, 401b, 401c, and the rake face continuous to the outer peripheral cutting edges 423 are adjacent in the circumferential direction. The cutting blades 422 can be machined together.

  In this embodiment and 3rd embodiment, one blade part has three parting blades. In other words, this embodiment and the third embodiment have three cutter pieces. However, the number of cutter pieces may be two or four or more. Moreover, in this embodiment and 3rd embodiment, it has several cutter pieces separable from each other. However, in the present embodiment and the third embodiment, the plurality of cutter pieces may be integrated, and may be in the same manner as the first embodiment and the second embodiment.

1: Bed 2: Column 3: Saddle 4: Head 5: Slider 6: Spindle unit 7: Rotary table 10: Cutter arbor 12: Cutter mounting part 13: Key groove 14: Male screw 15: Held part 17: Key 18: Fixed Nuts 100, 200, 300, 400: Skiving cutters 301a, 401a: Finishing blade cutter pieces 301b, 401b: First rough blade cutter pieces 301c, 401c: Second rough blade cutter pieces 110, 210, 310, 410: Substrate 311, 411: Dividing substrate 112, 312: Mounting hole 113, 313: Key groove 318: Pin hole 120, 220, 320, 420: Blade part 121, 221, 321: Cutting blade groove 122, 222, 322, 422: Cutting blades 122a, 222a, 322a: Finishing blade (reference blade)
122b, 322b: first rough blades 122c, 322c: second rough blades 222b, 222c, 222d, 222e: rough blades 123, 423: outer peripheral cutting blade 124: side cutting blade 125: rake face 126: outer peripheral flank 127: back surface 128: side clearance surfaces 319, 419: positioning pins (positioning members)
L: Blade streak W: Work piece Lw: Tooth streak Aa: Arbor axis line Ac: Cutter axis line Ah: Head axis line Am: Main axis line At: Table axis line Aw: Workpiece axis line Da: Axial direction Daa: Tip side Dab: Mounting side θ1: Scoop Angle θ2: Peripheral clearance angle θ3: Back angle θ4: Side clearance angle α: Torsion angle

Claims (11)

A base having a circular cross section perpendicular to the axis;
A plurality of blade portions protruding from the outer peripheral surface of the base body, spaced apart from each other in the circumferential direction with respect to the axis, and extending in a direction inclined with respect to the axis;
Have
The blade portion is divided into a plurality of divided blades by a cutting edge groove extending in a direction intersecting the blade stripe,
The dividing blade has an outer peripheral cutting edge that is an edge that is the farthest from the base body among the forming portions of the dividing blade,
Among the plurality of the cutting blades constituting the blade portion, any one cutting blade forms a reference blade, and the reference blade is related to an axis-cutting blade distance that is a distance from the axis to the outer peripheral cutting blade. The largest one or more remaining cutting blades gradually become smaller as the distance from the reference blade to the corresponding cutting blade increases.
The twist angle that is the angle of the blade streak with respect to the axis varies depending on the position in the axial direction of the plurality of cutting blades constituting the blade portion,
Skiving cutter. The skiving cutter according to claim 1,
The torsion angle of one or more cutting blades excluding the reference blade among the plurality of cutting blades constituting the blade portion is increased as the distance from the reference blade to the corresponding cutting blade increases. The amount of change with respect to the twist angle is large.
Skiving cutter. The skiving cutter according to claim 1 or 2,
The twist angle of one or more of the cutting blades excluding the reference blade among the plurality of cutting blades constituting the blade portion increases as the distance from the reference blade to the corresponding cutting blade increases. ,
Skiving cutter. In the skiving cutter according to any one of claims 1 to 3,
Among the two cutting blades adjacent to each other in the blade stripe direction in which the reference blade is the highest and the blade stripe extends, the cutting edge of the plurality of cutting blades constituting the blade portion is one of the cutting blades far from the reference blade. The blade edge of the blade is less than or equal to the edge of the other parting blade,
Skiving cutter. In the cutter for skiving processing according to any one of claims 1 to 4,
The blade width of the plurality of cutting blades constituting the blade portion is the one cutting blade farthest from the reference blade among the two cutting blades adjacent to each other in the blade stripe direction in which the reference blade is widest and the blade stripe extends. The blade width is equal to or less than the blade width of the other parting blade,
Skiving cutter. In the cutter for skiving processing according to any one of claims 1 to 5,
The cutting blade includes a rake surface that extends from the outer peripheral cutting edge toward the base, an outer peripheral flank extending in a direction along the blade streak from the outer peripheral cutting edge, and the outer peripheral cutting edge at the outer peripheral flank. Has a back surface extending from the opposite end to the side approaching the base body, and
A rake angle that is an angle of the rake face with respect to a virtual plane perpendicular to the blade stripe is 0 ° or more and 20 ° or less.
Skiving cutter. The skiving cutter according to claim 6,
The back angle, which is the angle of the back surface with respect to a virtual plane perpendicular to the blade stripe, is 10 ° or more and 50 ° or less.
Skiving cutter. The skiving cutter according to claim 6 or 7,
An outer peripheral clearance angle, which is an angle of the outer peripheral flank with respect to the blade stripe, is greater than 0 ° and not more than 12 °.
Skiving cutter. In the cutter for skiving processing according to any one of claims 1 to 8,
The outer peripheral cutting edge of the cutting blade having a twist angle of 10 ° or less is in a virtual plane perpendicular to the axis.
Skiving cutter. In the cutter for skiving processing according to any one of claims 1 to 8,
The outer peripheral cutting edge of the cutting blade having a twist angle α of greater than 10 ° is in a virtual plane perpendicular to the blade streaks;
Skiving cutter. In the skiving cutter according to any one of claims 1 to 10,
A plurality of cutter pieces arranged in the axial direction,
The cutter piece includes a cutting blade row that is a group of a plurality of cutting blades that are aligned in the circumferential direction and are aligned in the circumferential direction among the cutting blades that constitute each of the plurality of blade portions. A parting base in which the parting blade row is formed on the outer periphery of a part of the base, and
The divided substrates are separable from each other;
Furthermore, a positioning member that defines a relative position in the circumferential direction of the cutting blade between the plurality of cutter pieces is provided.
Skiving cutter.

Images